EP1809922B1 - Module d'amortissement pneumatique - Google Patents

Module d'amortissement pneumatique Download PDF

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Publication number
EP1809922B1
EP1809922B1 EP05797041A EP05797041A EP1809922B1 EP 1809922 B1 EP1809922 B1 EP 1809922B1 EP 05797041 A EP05797041 A EP 05797041A EP 05797041 A EP05797041 A EP 05797041A EP 1809922 B1 EP1809922 B1 EP 1809922B1
Authority
EP
European Patent Office
Prior art keywords
shock absorber
piston
cover
air spring
piston cover
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP05797041A
Other languages
German (de)
English (en)
Other versions
EP1809922A1 (fr
Inventor
Reinhard Stahmer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ContiTech Luftfedersysteme GmbH
Original Assignee
ContiTech Luftfedersysteme GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ContiTech Luftfedersysteme GmbH filed Critical ContiTech Luftfedersysteme GmbH
Publication of EP1809922A1 publication Critical patent/EP1809922A1/fr
Application granted granted Critical
Publication of EP1809922B1 publication Critical patent/EP1809922B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/02—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum
    • F16F9/04—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum in a chamber with a flexible wall
    • F16F9/05—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum in a chamber with a flexible wall the flexible wall being of the rolling diaphragm type
    • F16F9/057—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum in a chamber with a flexible wall the flexible wall being of the rolling diaphragm type characterised by the piston
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G15/00—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type
    • B60G15/08—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having fluid spring
    • B60G15/12—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having fluid spring and fluid damper
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/06—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid
    • F16F9/08—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid where gas is in a chamber with a flexible wall
    • F16F9/084—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid where gas is in a chamber with a flexible wall comprising a gas spring contained within a flexible wall, the wall not being in contact with the damping fluid, i.e. mounted externally on the damper cylinder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
    • B60G2202/30—Spring/Damper and/or actuator Units
    • B60G2202/31—Spring/Damper and/or actuator Units with the spring arranged around the damper, e.g. MacPherson strut
    • B60G2202/314—The spring being a pneumatic spring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
    • B60G2204/10—Mounting of suspension elements
    • B60G2204/12—Mounting of springs or dampers
    • B60G2204/126—Mounting of pneumatic springs
    • B60G2204/1262—Mounting of pneumatic springs on a damper

Definitions

  • Such air spring damper modules are mainly used as struts on the front axle in commercial vehicles in use.
  • the coaxial, nested arrangement of air spring and shock absorber in an air spring-damper module can be the necessary Reduce installation space for the suspension and damping in the commercial vehicle, which benefits a wider spring track and a larger steering angle.
  • the bellows with closure plate and rolling piston acts like a known per se air suspension, the operating principle of the shock absorber also corresponds to the known prior art.
  • the shock absorbers are often closed at their in the installation position upwardly facing end with a lid which is held by a roll of the outer tube of the shock absorber inwardly over the lid tightly in position.
  • the roll is a purely positive connection of outer tube and cover. It is therefore particularly sensitive to bending stress and plastic deformation.
  • the rolling piston additionally has a buffer support, which is slipped inside the rolling piston over the upper end of the shock absorber and is also supported on the annular flange of the shock absorber.
  • the bump stop or an additional spring which are arranged in or on the closure plate of the air spring bellows, beats, for example in the case of a breakthrough of the air spring, on a baffle plate fixed to the upper end of the buffer support.
  • This design serves to protect the rolling piston from excessive deformation and the rolling of the shock absorber from excessive loads at high loads.
  • the disadvantage here is that such rolling piston are complicated, heavy and therefore expensive.
  • the DE 197 55 549 C2 describes an air spring damper module in which the rolling piston rests flat on the upper end of the shock absorber.
  • the entire spring force and, in the case of a contact of the stop buffer with the piston cover, the entire buffer force is therefore supported on the upper end of the shock absorber and the roll of the outer tube arranged there.
  • An annular flange on the outer tube is not available here.
  • the closure of the outer tube of the shock absorber is exposed to very high loads. If the closure is designed as a roll, it is easy to leaks and decreasing damper performance because of the special sensitivity of the roll over bending stress.
  • the DE 100 24 983 C1 shows a solution in which the rolling piston spaced from the upper end of the shock absorber is fixed in unspecified manner and the buffering force is intercepted by a protective cover on the rolled end of the shock absorber.
  • the protective cover does not dissolve during operation and to reliably prevent contact with the rolling of the outer tube, the protective cover must be firmly connected to the outer tube.
  • the mounting of the protective cover on the outer tube is possible only after the assembly of the rolling piston on the shock absorber. Dismantling of the shock absorber, for example, for replacement, is here made very difficult or impossible by the permanently attached protective cover.
  • the EP0318696 A shows another air spring-damper module having the features of the preamble of claim 1.
  • the invention has for its object to provide a structurally simplified air spring damper module of the type described, in which the closure of the shock absorber is protected from high loads and allows easy mounting and dismounting of shock absorbers and rolling piston.
  • the shutter Due to the gap between the inner surface of the piston cover and the shock absorber, the shutter is not loaded at all by the air spring during normal operation. All forces are transmitted via the rolling piston on the annular flange of the outer tube of the shock absorber. Upon contact of the stop buffer with the piston cover initially deforms the rolling piston elastic, so that the gap is smaller. When a certain load is exceeded, the inner surface of the piston cover sets on the upper end of the shock absorber. Only now must the shutter of the shock absorber absorb forces that are smaller compared to the prior art by the amount that receives the piston cover of forces. This is particularly advantageous if the closure of the shock absorber is carried out with a roll, since this is largely protected by the inventive solution from damaging loads.
  • the centering flange facilitates the assembly of shock absorbers and rolling piston.
  • the shock absorber can be easily inserted into the rolling piston and is guided at its upper end by the conical frame of the centering flange. This prevents buckling of the air spring damper module at the connection of rolling piston and shock absorber.
  • the centering flange is a simple, lightweight component and easy to install already during production of the rolling piston. This eliminates an additional assembly step.
  • the centering flange does not need to be fixed to the outer tube of the shock absorber, allowing for easy assembly and disassembly of the shock absorber.
  • the centering flange is formed as a protuberance of the piston cover directly from the material of the piston cover.
  • This arrangement has the advantage that no separate operation for fixing the Zentrierflansches on the piston cover is necessary.
  • a further embodiment of the invention is characterized in that the piston cover is at least partially designed as a centric concave buffer stop surface so that when striking the stop buffer on the buffer stop surface rolling piston and stop buffer are aligned centrally with each other.
  • the advantage of this arrangement is that the stop buffer is guided by the concave buffer stop surface. As a result, the risk of buckling of the air spring-damper module, for example, reduced by off-center loads.
  • a shock absorber protective cover is mounted on the upper end of the shock absorber, wherein the rolling piston is arranged on the shock absorber, that the inner surface of the piston cover and the shock absorber protective cover are spaced by a gap, wherein only upon impact the stop buffer on the piston cover and exceeding a predetermined load occurring on the piston cover, the inner surface of the piston cover touches the shock absorber protective cover.
  • the shock absorber cover itself is known.
  • the solution according to the invention has the advantage that the inner surface of the piston cover touches on the shock absorber protection cover only when a specific load is exceeded and only then must absorb forces. These forces are transmitted evenly to the shutter of the shock absorber due to the guidance of the shock absorber cover by the shock absorber outer tube. Point-like loads on the closure are thus avoided.
  • the shock absorber protective cover is supported on the outer tube of the shock absorber so that the friction prevailing between the protective cover and the outer tube absorbs part of the forces acting on the protective cover. This is a particularly good protection of the shock absorber closure given.
  • the shock absorber protective cover has a central centering collar pointing upward in the installed position, which is arranged so that it engages vertically between the damper rod and the piston cover in the opening of the piston cover.
  • This collar is that the shock absorber protective cover and thus the shock absorber over the rolling piston is guided centrally. As a result, the risk of buckling of the air spring-damper module is reduced in the case of load.
  • FIG. 1 shown inventive air spring damper module has a shock absorber 1 with an annular flange 2, an eye 3 for mounting the shock absorber 1 on a chassis of a commercial vehicle body and a damper rod 4.
  • the chassis and the commercial vehicle body are not shown here.
  • a rolling piston 5 is placed, which is supported on the annular flange 2.
  • the rolling piston 5 has a piston cover 6.
  • a conical seat 7 is arranged, wherein the conical seat 7 has a perforated in the piston interior perforated buffer stop surface 8.
  • the damper rod 4 is passed through the buffer stop surface 8.
  • an air spring bellows 10 is placed, which rolls on the rolling piston 5 and with a sealing bead 11 forms an airtight connection between rolling piston 5 and air spring bellows 10.
  • the air bag 10 is at its upper end with a Closure plate 12 hermetically sealed. Centered in the closure plate 12, a shock absorber bearing 13 is arranged, on which the piston rod 4 of the shock absorber 1 is attached.
  • the stop buffer is used to prevent direct contact of the closure plate 12 with the rolling piston 5 at high loads of the air spring-damper module. If the air spring bellows 10 springs beyond the operational deflection, the stop buffer 14 hits the buffer abutment surface 8 of the rolling piston 5.
  • a centering flange 15 is welded onto the underside of the buffer abutment surface 8.
  • Fig. 2 is the lid portion of the rolling piston 5 in the unloaded state shown in longitudinal section.
  • the centering flange 15 has a bottom ring surface 16 and a conical frame 17.
  • the taper serves to facilitate assembly.
  • the shock absorber has an outer tube 18 and a cover 19.
  • the outer tube 18 is closed at the upper end by a Verrollung 20 against the lid 19.
  • the sensitive roll 20 is spared in normal operation of the air spring-damper module.
  • the buffer stop surface 8 springs so far down through that the centering flange 15 is supported on the outer tube 18 of the shock absorber 1.
  • Fig. 3 is a further embodiment of an air spring-damper module according to the invention shown in partial longitudinal section.
  • a shock absorber protection cover 22 is fixed, which rests on the shutter 20 of the shock absorber and extending around the outer tube 18 of the shock absorber 1 axially extending by a predetermined length.
  • the protective cover 22 is axially guided against the shock absorber 1.
  • the protective cover 22 sits tight on the outer tube 18, so that between the outer tube 18 and the protective cover 22, a friction zone 23 is formed, which can absorb the forces acting in the axial direction of the protective cover 22 at least partially.
  • the Fig. 4 shows an air spring damper module similar to the air spring damper module Fig. 3 ,
  • the shock absorber protective cover 22 on an axially upward from the protective cover 22 projecting centering collar 24, the play-prone between damper rod 4 and piston cover 6 projects into the opening 9 of the piston cover 6.
  • the protective cover 22 and thus the shock absorber 1 is guided against the rolling piston 5, whereby buckling of the air spring-damper module can be prevented in case of any transverse forces occurring.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Damping Devices (AREA)

Claims (6)

  1. Module d'amortissement pneumatique, comprenant :
    - un amortisseur (1),
    - avec un tube extérieur (18) comprenant une fermeture (20) sur une extrémité supérieure de l'amortisseur (1) tournée vers le haut dans la position de montage,
    - avec une bride annulaire (2) fixée sur le tube extérieur (18) à distance de l'extrémité supérieure de l'amortisseur (1),
    - avec une tige d'amortisseur (4),
    - un piston de déroulage (5) disposé à l'extrémité supérieure de l'amortisseur (1),
    - avec un couvercle de piston (6) pourvu d'une surface extérieure et d'une surface intérieure et d'une ouverture centrale (9) pour la tige d'amortisseur (4), et
    - avec un fond de piston muni d'une ouverture centrale,
    - un soufflet pneumatique (10) disposé et fixé sur le piston de déroulage (5), avec une ouverture associée au piston de déroulage (5) et une ouverture opposée au piston de déroulage (5),
    - une plaque de fermeture (12) fermant le soufflet pneumatique (10) au niveau de l'ouverture opposée au piston de déroulage (5),
    - un tampon de butée (14) disposé à l'intérieur du soufflet pneumatique (10) et constitué d'un matériau élastomère,
    le piston de déroulage (5) avec l'ouverture dans le fond de piston étant recourbé par-dessus l'extrémité supérieure de l'amortisseur (1) et le fond de piston s'appuyant par le biais de la bride annulaire (2) sur le tube extérieur (18) de l'amortisseur (1),
    le piston de déroulage (5), dans l'état de fonctionnement du module d'amortissement pneumatique, étant disposé sur l'amortisseur (1) de telle sorte que la surface interne du couvercle de piston (6) et que la fermeture (20) de l'amortisseur (1) soient séparées par une fente (21), caractérisé en ce que seulement lorsque le tampon de butée (14) vient buter contre le couvercle de piston (6) et qu'une charge prédéterminée ainsi appliquée sur le couvercle de piston (6) est dépassée, la surface intérieure du couvercle de piston (6) se pose sur la fermeture (20) de l'amortisseur (1).
  2. Module d'amortissement pneumatique selon la revendication 1, caractérisé en ce que sur le côté du couvercle de piston (6) opposé au tampon de butée (14), est fixée centralement une bride de centrage (15) en forme de godet, avec une surface annulaire de fond (16) conique tournée vers le couvercle de piston (6) et un châssis (17) conique, pouvant être replié sur l'amortisseur (1), le piston de déroulage (5) et l'amortisseur (1) étant disposés l'un par rapport à l'autre de telle sorte que dans l'état non sollicité du module d'amortissement pneumatique, l'amortisseur (1) et la bride de centrage (15) soient séparés par une fente (21).
  3. Module d'amortissement pneumatique selon la revendication 2, caractérisé en ce que la bride de centrage (15) est façonnée sous forme de repli du couvercle de piston (6) directement à partir du matériau du couvercle de piston (6).
  4. Module d'amortissement pneumatique selon l'une quelconque des revendications précédentes, caractérisé en ce que le couvercle de piston (6) est réalisé au moins en partie sous forme de surface de butée tampon centrale concave (8), en ce que lorsque le tampon de butée (14) vient en butée contre la surface de butée tampon (8), le piston de déroulage (5) et le tampon de butée (14) sont orientés centralement l'un par rapport à l'autre.
  5. Module d'amortissement pneumatique selon l'une quelconque des revendications précédentes, caractérisé en ce que sur l'extrémité supérieure de l'amortisseur (1) est enfoncé un recouvrement de protection de l'amortisseur (22), le piston de déroulage (5) étant disposé de telle sorte sur l'amortisseur (1) que la surface interne du couvercle de piston (6) et que le recouvrement de protection (22) de l'amortisseur soient séparés par une fente (21), et seulement lorsque le tampon de butée (14) vient buter contre le couvercle de piston (6) et qu'une charge prédéterminée ainsi appliquée sur le couvercle de piston (6) est dépassée, la surface intérieure du couvercle de piston (6) se pose sur le recouvrement de protection (22) de l'amortisseur.
  6. Module d'amortissement pneumatique selon la revendication 5, caractérisé en ce que le recouvrement de protection (22) de l'amortisseur présente un épaulement de centrage (24) central tourné vers le haut dans la position de montage, lequel est disposé de telle sorte qu'il vienne en prise entre la tige d'amortisseur (4) et le couvercle de piston (6) verticalement dans l'ouverture (9) du couvercle de piston (6).
EP05797041A 2004-11-04 2005-09-28 Module d'amortissement pneumatique Not-in-force EP1809922B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004053256A DE102004053256A1 (de) 2004-11-04 2004-11-04 Luftfeder-Dämpfer-Modul
PCT/EP2005/010464 WO2006048085A1 (fr) 2004-11-04 2005-09-28 Module d'amortissement pneumatique

Publications (2)

Publication Number Publication Date
EP1809922A1 EP1809922A1 (fr) 2007-07-25
EP1809922B1 true EP1809922B1 (fr) 2009-03-11

Family

ID=35431166

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05797041A Not-in-force EP1809922B1 (fr) 2004-11-04 2005-09-28 Module d'amortissement pneumatique

Country Status (4)

Country Link
EP (1) EP1809922B1 (fr)
AT (1) ATE425385T1 (fr)
DE (2) DE102004053256A1 (fr)
WO (1) WO2006048085A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10125840B2 (en) * 2014-10-17 2018-11-13 Continental Automotive Systems, Inc. Air spring hybrid piston assembly

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5009401A (en) * 1986-07-14 1991-04-23 Bridgestone/Firestone, Inc. Air spring suspension system with dual path isolation
DE19755549C2 (de) * 1997-04-25 2001-09-27 Mannesmann Sachs Ag Federbein für Fahrzeuge
DE19959839A1 (de) * 1998-12-14 2000-07-06 Mannesmann Sachs Ag Luftfeder mit einem Schwingungsdämpfer
DE10024983C1 (de) * 2000-05-19 2001-10-31 Mannesmann Sachs Ag Querkraftkompensation bei Luftfederbeinen

Also Published As

Publication number Publication date
DE502005006842D1 (de) 2009-04-23
WO2006048085A1 (fr) 2006-05-11
ATE425385T1 (de) 2009-03-15
DE102004053256A1 (de) 2006-05-11
EP1809922A1 (fr) 2007-07-25

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